package yukiCoder;

import java.util.Calendar;

public class No00188 {

	public static void main(String[] args) {
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.YEAR, 2015);
		int ans = 0;
		for (int month = 1; month <= 12 ; month++) {
			calendar.set(Calendar.MONTH, month-1);

			for (int i = 1 ; i <= calendar.getActualMaximum(Calendar.DATE) ; i++) {
				int tensPlace = 0;
				int onesPlace = 0;
				if (String.valueOf(i).length() != 2) {
					tensPlace = 0;
					onesPlace = Character.getNumericValue(String.valueOf(i).charAt(0));
				} else {
					tensPlace = Character.getNumericValue(String.valueOf(i).charAt(0));
					onesPlace = Character.getNumericValue(String.valueOf(i).charAt(1));
				}

				if (month == Integer.sum(tensPlace, onesPlace)) {
					ans++;
				}
			}
		}
		System.out.println(ans);

	}

}